基于油膜干涉法的表面摩擦应力测量技术研究

本文应用油膜干涉法及速度型方法在平板模型上进行低速湍流的表面摩擦阻力测量,探索了油膜法测量表面摩擦阻力的实验技术,分析了不同实验方式对测量结果的影响以及实验误差产生的原因.研究表明,模型安装方式、油膜布置方式以及重力作用的影响在油膜干涉法中基本都可以忽略,在精度要求不高的情况下,不需要对结果进行修正.通过采用热膜法和油...

Study of Skin Friction Stress Measurement Technique Based on Oil Film Interferometry

Oil film interferometry and velocity profile method were used to measure skin friction stress of a flat plate model in low-speed turbulence. Skin friction measurement technique based on oil film was explored. The influence of different experimental methods on measurement results and the cause of experimental errors were analyzed. Results show that the influence of model installation, oil film arrangement and gravity in oil film interferometry may be neglected, and the experiment data may be processed by the original formulas directly in the case of low precision requirement. Skin friction of an airfoil was measured by using both oil film interferometry and hot-film. Results indicate that oil film interferometry is an experimental technique with extensive application in wind tunnel, and may be applied in high-speed wind tunnel and large transport aircraft flight experiment.